Question

Can you give an example of using JRadioButton in Java?

Answer 1

Sure, here's an example of using JRadioButtons in Java:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JRadioButtonExample extends JFrame implements ActionListener {
    private JRadioButton radioButton1, radioButton2;
    private ButtonGroup buttonGroup;
    private JLabel label;

    public JRadioButtonExample() {
        // Set up the frame
        setTitle("JRadioButton Example");
        setSize(300, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        // Create the radio buttons and button group
        radioButton1 = new JRadioButton("Option 1");
        radioButton2 = new JRadioButton("Option 2");
        buttonGroup = new ButtonGroup();
        buttonGroup.add(radioButton1);
        buttonGroup.add(radioButton2);

        // Add action listeners to the radio buttons
        radioButton1.addActionListener(this);
        radioButton2.addActionListener(this);

        // Create a label to display the selected option
        label = new JLabel("No option selected");

        // Add the components to the frame
        add(radioButton1);
        add(radioButton2);
        add(label);

        // Show the frame
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (radioButton1.isSelected()) {
            label.setText("Option 1 selected");
        } else if (radioButton2.isSelected()) {
            label.setText("Option 2 selected");
        }
    }

    public static void main(String[] args) {
        JRadioButtonExample example = new JRadioButtonExample();
    }
}
 

This example creates a JFrame window with two JRadioButtons labeled "Option 1" and "Option 2". The JRadioButtons are added to a ButtonGroup to ensure that only one can be selected at a time. An ActionListener is added to each JRadioButton to handle the selection events.

When a JRadioButton is selected, the actionPerformed method is called and the label text is updated to reflect the selected option. In this example, the label displays either "Option 1 selected" or "Option 2 selected" depending on which button is selected.